feat(mobile): Adds WiFi only backup option to iOS

[martyfuhry]

I've added the "Only on Wifi" backup option to iOS by using the NwPathMonitor and querying for

let wifiMonitor = NWPathMonitor(requiredInterfaceType: .wifi)
let isExpensive = wifiMonitor.currentPath.isExpensive

I did not do any end-to-end testing, but I've tested this:

Which is correctly reporting that I am on Wi-Fi and the connection is not expensive. Someone who typically uses an iPhone to debug could roll this change up and test it on their device! Or else I could play with some of the "Schedule background fetch" options in XCode. Testing these backups will always be a pain...

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View logs

[alextran1502]

I just finished the end-to-end test, and assets are still uploaded using cellular while the setting is on

[martyfuhry]

I just finished the end-to-end test, and assets are still uploaded using cellular while the setting is on

Hmm, dang. isExpensive indicates that it should work:

A Boolean indicating whether the path uses an interface that is considered expensive, such as Cellular or a Personal Hotspot.

So either my logic is wrong or else that boolean isn't returning correctly on cellular. I don't normally develop on an iPhone that has cellular, but I can grab one. I'd like to see the output of isExpensive when the device is clearly on Cellular and not Wi-Fi.